4895-Geotech Assessment

Mr Max Richardson                                                                                       20362-001-Rev0
C/- Long View Consulting Engineers Pty Ltd                                                                 28 July 2021

2.2    Topography
As illustrated in Text Figure 5, the proposed house site and most of the proposed access driveway trace the
crest of a north-west/south-east trending ridgeline, with the south-eastern end of the proposed driveway
following an existing track just off the crest. The shape of the ground surface across these development
areas is strongly divergent, which is favourable from a slope stability viewpoint, whereas convergent gully
areas are subject to greater surface water, groundwater, and soil accumulation which is why landslides are
more prevalent in these landforms. The proposed house site and driveway alignment are well setback from
gullies. Inferred natural gradients measured using a hand-held clinometer along the proposed driveway and
at the house site typically ranged up to about 10°, but increased to 25° and steeper moving down the ridge
flanks. The existing road cutting near the proposed driveway connection was measured to dip at about 50°.

                                  Proposed house site




                                                                   Existing track




Text Figure 5: Image showing ground surface contours (courtesy Noose Council [NC] Interactive Maps)

Text Figures 6 and 7 below and on the following page illustrate the site conditions at the time of our
inspection.




                                      Existing track




Text Figure 6: View looking north-west along existing track at south-eastern end of proposed driveway




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